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Biotech Growth N.V. is a wholly-owned subsidiary of BB Biotech AG. Accordingly, BB Biotech AG may be deemed to be the indirect beneficial owner of the securities of Radius Health, Inc. held directly or indirectly by Biotech Growth N.V. This Form 4 is filed jointly by BB Biotech AG and Biotech Growth N.V.

/s/ Ivo Betschart

10/26/2017

** Signature of Reporting Person

Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).